Hi there.
If you have just missed your period by a few days, it is indeed to early to tell if you are pregnant.
Usually, the HCG levels in the blood that are secreted by the implanted fertilized egg is still not adequate
during this short span of time.
It is best to wait for another two weeks before taking another test, but I won't be surprised if this can
also be just due to delayed menses. For now, it is best to act and eat as if you are indeed pregnant
(avoiding alcohol, cigarette smoke, avoiding over the counter drugs) until this can be confirmed or
disproved.
Regards and God bless.